Result ptr variable not initialized properly about taco

[fredrikbk]

@shoaibkamil located the crash occurs in test matrix_add/expr.storage/2 on line 2, because A1_ptr is not initialized at that point:

 1 #ifndef TACO_C_HEADERS
  2 #define TACO_C_HEADERS
  3 #include <stdio.h>
  4 #include <stdlib.h>
  5 #include <math.h>
  6 #define TACO_MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
  7 #endif
  8 int assemble(void** inputPack) {
  9   void** A = &(inputPack[0]);
 10   void** b = &(inputPack[4]);
 11   void** c = &(inputPack[8]);
 12   int* restrict A_L1_ptr = (int*)A[1];
 13   int jb;
 14   int b2_ptr;
 15   int ib;
 16   int b1_ptr;
 17   int jc;
 18   int A1_ptr;
 19   int A2_ptr;
 20   int c1_ptr;
 21   int c2_ptr;
 22   int* restrict b_L1_ptr = (int*)b[1];
 23   int* restrict c_L1_ptr = (int*)c[1];
 24   int* restrict b_L1_idx = (int*)b[2];
 25   int* restrict c_L1_idx = (int*)c[2];
 26   int j;
 27   int* restrict A_L1_idx = (int*)A[2];
 28   A2_ptr = A_L1_ptr[A1_ptr];
 29   for (int ib = 0; ib < 3; ib += 1) {
 30     b1_ptr = ((0 * 3) + ib);
 31     c1_ptr = ((0 * 3) + ib);
 32     A1_ptr = ((0 * 3) + ib);

[fredrikbk]

We should fix this issue by cleaning up the parts of lowering that deals with the result iterators.

[stephenchouca]

@Lugatod 635bb4d should fix this. Can you verify that this is indeed the case? I was unable to reproduce the original crash on my machine.

[Lugatod]

Yes the bug is fixed